A 24–30 GHz Low-Loss Compact Differential Four-Way Power Divider

A differential four-way power divider in 65 nm CMOS process for a beamforming front-end IC is presented, which provides stable virtual grounds regardless of grounding inductance variations. The chip size is reduced by using a 4-way Wilkinson power divider based on lumped elements. It has a small core chip size of 0.09 mm’. At 24 to 30 GHz, it has a low insertion loss of only 0.93 to 1.94 dB, a port-to-port isolation of 19.1 to 25.6 dB from 24 to 30 GHz. It has small amplitude and phase difference which are much better than a single-ended structure.